--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/GraalCompiler/src/com/sun/c1x/ir/IRScope.java	Wed Apr 27 11:50:44 2011 +0200
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.sun.c1x.ir;
+
+import com.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
+
+/**
+ * The {@code IRScope} class represents an inlining context in the compilation
+ * of a method.
+ *
+ * @author Ben L. Titzer
+ */
+public class IRScope {
+
+    public final IRScope caller;
+    public final RiMethod method;
+    public final int level;
+    CiCodePos callerCodePos;
+
+    /**
+     * The frame state at the call site of this scope's caller or {@code null}
+     * if this is not a nested scope.
+     */
+    public final FrameState callerState;
+
+    /**
+     * The maximum number of locks held in this scope at any one time
+     * (c.f. maxStack and maxLocals of the Code attribute in a class file).
+     */
+    int maxLocks;
+
+    CiBitMap storesInLoops;
+
+    public IRScope(IRScope caller, FrameState callerState, RiMethod method, int osrBCI) {
+        this.caller = caller;
+        this.callerState = callerState;
+        this.method = method;
+        this.level = caller == null ? 0 : 1 + caller.level;
+    }
+
+    /**
+     * Updates the maximum number of locks held in this scope at any one time.
+     *
+     * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} for this scope if it is greater
+     */
+    public void updateMaxLocks(int locks) {
+        if (locks > maxLocks) {
+            maxLocks = locks;
+        }
+    }
+
+    /**
+     * Gets the number of locks in this IR scope.
+     * @return the number of locks
+     */
+    public final int maxLocks() {
+        return maxLocks;
+    }
+
+    /**
+     * Gets the bytecode index of the call site that called this method.
+     * @return the call site's bytecode index
+     */
+    public final int callerBCI() {
+        return callerState == null ? -1 : callerState.bci;
+    }
+
+    /**
+     * Returns whether this IR scope is the top scope (i.e. has no caller).
+     * @return {@code true} if this inlining scope has no parent
+     */
+    public final boolean isTopScope() {
+        return caller == null;
+    }
+
+    /**
+     * Gets the phi bitmap for this IR scope. The phi bitmap stores
+     * whether a phi instruction is required for each local variable.
+     * @return the phi bitmap for this IR scope
+     */
+    public final CiBitMap getStoresInLoops() {
+        return storesInLoops;
+    }
+
+    public final void setStoresInLoops(CiBitMap storesInLoops) {
+        this.storesInLoops = storesInLoops;
+    }
+
+    @Override
+    public String toString() {
+        if (caller == null) {
+            return "root-scope: " + method;
+        } else {
+            return "inlined-scope: " + method + " [caller bci: " + callerState.bci + "]";
+        }
+    }
+
+    public CiCodePos callerCodePos() {
+        if (caller != null && callerCodePos == null) {
+            callerCodePos = caller.toCodePos(callerBCI());
+        }
+        return callerCodePos;
+    }
+
+    public CiCodePos toCodePos(int bci) {
+        return new CiCodePos(callerCodePos(), method, bci);
+    }
+}